Which of the following interhalogen compounds is in liquid state at room temperature?

The property which is not true about Fluorine is,

The common form of periodic acid is $HIO_4 \cdot 2H_2O$ or $H_5IO_6$. What is this called?

Arrange the following in the order of property indicated for each set:
$(i)$ $F_{2}, Cl_{2}, Br_{2}, I_{2}$ - increasing bond dissociation enthalpy.
$(ii)$ $HF, HCl, HBr, HI$ - increasing acid strength.
$(iii)$ $NH_{3}, PH_{3}, AsH_{3}, SbH_{3}, BiH_{3}$ - increasing base strength.

$SF_{6}$ is known but $SCl_{6}$ is not. Why?

When iodine reacts with $NaF,$ $NaBr$ and $NaCl,$ what happens?